# Diffraction of Light: Diffraction Grating

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1. A diffraction grating with 2.10E3 slits per centimeter is used to measure the wavelengths emitted by hydrogen gas.

At what angles in the first-order spectrum would you expect to find the two violet lines of wavelengths 434 nm

and 410 nm?

(a) At what angle in the first-order spectrum would you expect to find the first violet line of wavelengths

434 nm?

(b) At what angle in the first-order spectrum would you expect to find the second violet line of

wavelength 410 nm?

2. What is the longest wavelength that can be observed in the fifth-order (m=5) spectrum using a diffraction grating with

3.60E3 slits per centimeter? (Unit: nm)

All answers must have three significant digits unless otherwise specified.

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Two problem related to the calculation for the angle of first order and other maxima.

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1. For a diffraction grating if a is the width of the slit and b is the width of the line (opaque) then the ...

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